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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Cash flows from operating activities: |  |  |
Net income | $ 338,301 | $ 265,945 | $ 199,223
Adjustments required to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 167,360 | 176,546 | 184,092
Share-based compensation | 176,658 | 182,704 | 153,030
Accrued severance pay, net | 789 | 1,171 | 597
Amortization of premium, discount and accrued interest on marketable securities | 2,480 | 8,322 | 11,867
Deferred taxes, net | (66,620) | (52,618) | (39,316)
Changes in operating assets and liabilities: |  |  |
Trade receivables, net | (34,292) | (129,712) | (85,778)
Prepaid expenses and other current assets | 73,052 | (31,673) | (79,624)
Trade payables | 3,426 | 19,923 | (389)
Accrued expenses and other current liabilities | (55,703) | 33,684 | 64,179
Operating lease right-of-use assets | 12,518 | 20,393 | 15,075
Deferred revenue | (45,947) | 6,417 | 30,770
Realized loss on marketable securities, net | 12,271 | 0 | 0
Operating lease liabilities | (11,100) | (26,191) | (18,011)
Amortization of discount on long-term debt | 4,615 | 4,582 | 14,469
Loss from extinguishment of debt | 53 | 1,206 | 13,969
Change in fair value of contingent consideration | (18,258) | 0 | 0
Other | 1,827 | (984) | (2,337)
Net cash provided by operating activities | 561,430 | 479,715 | 461,816
Cash flows from investing activities: |  |  |
Purchase of property and equipment | (29,205) | (31,893) | (24,771)
Purchase of investments | (230,263) | (396,297) | (322,129)
Proceeds from sales of marketable investments | 436,044 | 355,560 | 270,645
Payments for business acquisitions, net of cash acquired | (415,185) | (29,724) | (142,804)
Capitalization of internal use software costs | (54,974) | (49,997) | (42,440)
Net cash used in investing activities | (293,583) | (152,351) | (261,499)
Cash flows from financing activities: |  |  |
Proceeds from issuance of shares upon exercise of options | 2,570 | 953 | 4,426
Purchase of treasury shares | (288,443) | (144,944) | (73,180)
Dividends paid to non-controlling interest | (1,771) | (376) | (1,754)
Purchase of subsidiaries shares from non-controlling interest | 0 | 0 | (14,000)
Repayment of debt | (2,628) | (20,132) | (177,308)
Net cash used in financing activities | (290,272) | (164,499) | (261,816)
Effect of exchange rate changes on cash | 2,643 | (8,425) | (2,112)
Net change in cash, cash equivalents and restricted cash | (19,782) | 154,440 | (63,611)
Cash, cash equivalents and restricted cash at the beginning of the year | 533,096 | 378,656 | 442,267
Cash, cash equivalents and restricted cash at the end of the year | 513,314 | 533,096 | 378,656
Reconciliation of cash, cash equivalents and restricted cash reported in the consolidated balance sheet: |  |  |
Cash and cash equivalents | 511,795 | 529,596 | 378,656
Restricted cash included in other current assets | 1,519 | 3,500 | 0
Total cash, cash equivalents and restricted cash shown in the statement of cash flows | 513,314 | 533,096 | 378,656
Cash paid during the year for: |  |  |
Income taxes | 210,445 | 123,586 | 97,258
Interest | 1,221 | 2,974 | 688
Non-cash activities: |  |  |
Change in fair value of contingent consideration | (18,258) | 0 | 0
Increase in accrued expenses and other liabilities with respect to purchase of treasury shares | $ 103 | $ 0 | $ 4

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